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Thread: pH level keeps going up ever since having pool replastered

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    pH level keeps going up ever since having pool replastered

    Hi,

    I expected this for the first season and over the winter following replastering, but this is the 3rd season and I still can't keep it down. I had checked it over the winter a few times before the pool froze and added acid several times, but some time between the freeze and spring start up (last week) the pH must have gone through the roof. The color on my taylor test kit was a really dark purple - I'm guessing probably even up to 9. It took many additions of acid to bring it down, but it seems to go right back up again. The other issue is that I developed some scale over the winter and so, not thinking to check on compatibility first, I went ahead and ordered 2 quarts of Bioguard Scale Inhibitor. THEN I find out that it is not compatible with my biguanide pool, so I have 2 quarts of the stuff that I no idea what to do with. I was told to use SoftSwim Stain Control instead (even though the primary purpose for this is to treat or prevent metal staining).

    In talking to BioGuard, I was told that the plaster can still continue to generate high pH even after 2-3 years of replastering, so I guess that's the situation I'm running into. Hopefully it'll settle down soon.

    I assume the forum does not have a buy / sell feature, since I'd be happy to list the Scale Inhibitor!

    Thanks,
    Keith
    12,000 gal. Anthony IG pool; 3 ft. shallow end to 6 ft. deep end; Built 1989; Renovated July 2014 using a 10-part unexposed quartz plaster aggregate of 3 S-grade Blue, 3 S-grade Gray, 2 T-grade Blue, 2 T-grade Gray; Apollo VA-52 DE Filter; Hayward SP-2607X10 Super Pump 1-HP Single Speed; Jandy AE-Ti Heat Pump; Taylor K-2006 Test Kit

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    Texas Splash's Avatar
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    Re: pH level keeps going up ever since having pool replastered

    Keith, your pH may also be rising quickly if your TA is elevated. What is your TA? Do you have any water features or aeration running as well?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Mod Squad pooldv's Avatar
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    Re: pH level keeps going up ever since having pool replastered

    Post the last few test results. It is important to manage your CSI, especially in a high/rising PH pool. To prevent scale keep CSI between 0 and -0.3. Poolmath will calculate your CSI for you, tweak PH and TA to adjust. CH, salt and borate also impacts CSI. Properly managed CSI can add a decade to your plaster life, or shorten just as much.

    More here, Pool School - Calcium Scaling

    You can sell stuff in the coffee bar.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: pH level keeps going up ever since having pool replastered

    Thanks for replies. I might just try listing my unused / unneeded chemicals in the coffee bar!

    Here are my recent results as requested:

    pH - between 7.5 - 8+
    TA - 110 - 120
    CH - 210 - 220

    No water features or aeration, no chlorine levels since I use biguanide
    12,000 gal. Anthony IG pool; 3 ft. shallow end to 6 ft. deep end; Built 1989; Renovated July 2014 using a 10-part unexposed quartz plaster aggregate of 3 S-grade Blue, 3 S-grade Gray, 2 T-grade Blue, 2 T-grade Gray; Apollo VA-52 DE Filter; Hayward SP-2607X10 Super Pump 1-HP Single Speed; Jandy AE-Ti Heat Pump; Taylor K-2006 Test Kit

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    Mod Squad pooldv's Avatar
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    Re: pH level keeps going up ever since having pool replastered

    Some folks here can help you punt that biguanide whenever you're ready.

    High TA and high PH are not great for pools. Keep lowering your PH to 7.2 when it gets above 7.8 and that will slowly bring down your TA. Or you can actively lower it following this, Pool School - Lower Total Alkalinity. Keep your PH at 7.8 or lower at all times. TA down in the 60-80 range is better

    Raise CH to 250 ppm, more here, Pool School - Recommended Pool Chemicals
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    Re: pH level keeps going up ever since having pool replastered

    Quote Originally Posted by pooldv View Post
    Some folks here can help you punt that biguanide whenever you're ready.

    High TA and high PH are not great for pools. Keep lowering your PH to 7.2 when it gets above 7.8 and that will slowly bring down your TA. Or you can actively lower it following this, Pool School - Lower Total Alkalinity. Keep your PH at 7.8 or lower at all times. TA down in the 60-80 range is better

    Raise CH to 250 ppm, more here, Pool School - Recommended Pool Chemicals

    I thought 80-120 was the preferred range for TA? And anything over 200 for CH?
    12,000 gal. Anthony IG pool; 3 ft. shallow end to 6 ft. deep end; Built 1989; Renovated July 2014 using a 10-part unexposed quartz plaster aggregate of 3 S-grade Blue, 3 S-grade Gray, 2 T-grade Blue, 2 T-grade Gray; Apollo VA-52 DE Filter; Hayward SP-2607X10 Super Pump 1-HP Single Speed; Jandy AE-Ti Heat Pump; Taylor K-2006 Test Kit

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    Re: pH level keeps going up ever since having pool replastered

    Quote Originally Posted by three4rd View Post
    I thought 80-120 was the preferred range for TA? And anything over 200 for CH?
    Trouble Free...using bleach 70 - 90
    Valley of the Sun, Arizona.....10k gunite/pebble (Re-surface March 2015) w/in floor Caretaker 99 cleaning heads -- Pentair FNS 60 DE filter -- Pentair IntelliFlo Variable Speed for pool -- Pentair Wisperflo 1 HP for boulder waterfall...Taylor K-2006 & Taylor K-2006C kits

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    Mod Squad pooldv's Avatar
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    Re: pH level keeps going up ever since having pool replastered

    Here are the recommended levels shown in Pool School
    Pool School - Recommended Levels
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: pH level keeps going up ever since having pool replastered

    Quote Originally Posted by oldguy70 View Post
    Trouble Free...using bleach 70 - 90
    OK...except that I don't use bleach in my pool. Thanks so much though.
    12,000 gal. Anthony IG pool; 3 ft. shallow end to 6 ft. deep end; Built 1989; Renovated July 2014 using a 10-part unexposed quartz plaster aggregate of 3 S-grade Blue, 3 S-grade Gray, 2 T-grade Blue, 2 T-grade Gray; Apollo VA-52 DE Filter; Hayward SP-2607X10 Super Pump 1-HP Single Speed; Jandy AE-Ti Heat Pump; Taylor K-2006 Test Kit

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